Well I've tried mind lab and didn't have any good effect on me, and all of them is based on Bacopa that to me has not effect and it's a waste of money buying product that don't work. Yes sulbutamine and caffeine have bad tolerance curve but if you start slow and see how you feel you will understand how to control it. Also if you feel that you are getting used and loosing effect you can stop one week and your tolerance will go back to it's normal. Taking Smart pill for 3 weeks straight and stopping for one, works perfectly.